Not very thick and it slides around on the carpet easily. If someone is standing on it the edges curl up and are a tripping hazard. That being said it allows my chair to move around on the carpet which is what it is supposed to do and what I needed it for.
The mat was not thick enough. It would roll back to the previous spot because it left indentations. I've been using a piece of ply-wood for years and thought I'd try the mat. I'm back to the ply-wood.
It's a good value for a small space. This mat isn't huge but for a small space it does a great job. Chair rolls smoothly over it and it does protect the floor without calling attention to the mat.